Pencil sharpener



Oct. 31, 1933'. ROHWEDDER 1,932,486

PENCIL SHARPENER Filed Jan. 17, 1933 me/vwo@ H. ROHWEDDER iatented @et31, 1933 unirse STATES PATENT orricr:

3 Claims.

The main object of this invention is the provision of a novel type ofpencil sharpener contained within a pencil holder adapted to be car-Aried in the pocket by means of a clip or clasp.

Another object -of the invention is the provision of such a pencilsharpener with a reversible, arched bladev having two cutting edges, theblade being reversed after one of said edges has become dulled throughuse, to present the fresh edge to the sharpening recess.

rThe above and other objects will become ap` parent in the descriptionbelow, in which characters of reference refer to like-named parts in thedrawing.

Referring briefly to the drawing, Figure 1 is a side view of theassembled device, showing the exterior.

Figure 2 is a cross-sectional View taken on the line 2 2 of Figure l.

Figure 3 is a cross-sectional View taken on the line 3-3 of Figure 2.

Figure 4 is a cross-sectional View taken on the line 4--4 of Figure 2.

Figure 5 is a cross-sectional View taken on the line 5 5 of Figure 2.

Figure 6 is a perspective View of the doubleedged, arched blade.

Referring in detail to the drawing, the nu-l meral 10 represents thebody of the holder, which is conical in form on the outside and has acylindrical channel 11, of varying diameter, extending entirelytherethrough. At the narrower end of the body l0, the channel is ofsmallest diameter, as indicated at the section 12. The adjacent section13 is of greater diameter than the section 12 and is provided with screwthreads 15. The next adjacent channel section 14 is of greater diameterthan the section 13, and the end of the section 14 is provided withscrew threads 16.

A solid screw plug 17, having an extension 21 of reduced diameter,threadably engages the threads 16 of the channel section 14, and isprovided with a knurled rim 18. The adjacent rim of the body 1G is alsoknurled. An eraser 19 of the usual pencil type is imbedded in theknurled cap 18 of the plug 17. A comrnon type of pocket clip 20 isprovided on the body of the pencil.

A conical recess 22 is eccentrically cut out of the plug 2l insuchmanner that-the generating line of the cone in one position is parallelto 1 the generating line of the cylindrical surface of the plug wherethe latter is nearest to the cone. 55 A slot 23 in the plug 21 extendsthe length of (Cl. 1Z0-87) and into, the conical cut out 22. At aperipheral distance from the slot 23 and parallel with the latter, arounded groove 24 is provided in thesurface of the plug 21. 1t is to benoted that the slot 23 is also provided with rounded 60 sides. The rslot23 and groove 24 define the rounded sides of a ridge 3l whose peripheralsurface therebetween is cylindrical. The blade 25 is of suchconformation that it fits snugly over the ridge 31, its central portion32 being 65 cylindrical in curvature and its opposite sides 26 and 27being rounded to conform to the rounded adjacent sides of the slot 23and groove 24. The edges of the sides 26 and 27 are sharpened to providecutting edges. A hole 28 is provided 70 centrally of the blade 25,through which a screw 29 passes to secure the blade in the plug 21.

In the channel section 13, an externally threaded nut 35 having asimilarly-threaded sleeve extension 33, threadably engages the threadedwall 15 of the sleeve section 13. A small hole 36 extends centrallythrough the nut 35, and the wall of the compartment 34 enclosed by thesleeve 33 is hexagonal. In one of these hexagonal walls a resilientfriction strip 40 is im- 80 bedded and is secured therein by a screw 37passing through the sleeve 33, the outer surface of the sleeve beingcountersunk at 38 to accommodate the head of the screw. A common type ofwood pencil 39, having hexagonal sides, is adapted for use incombination with this device.

Normally, the'entire device is carried in the pocket and the relativeparts are in the position shown in Figure 1, with the pencil ready foruse. v When the length of the pencil has been too far reduced, or whenfor any reason it is desired to increase the length of pencil extendingoutward from the channel section 12, the pencil 39 is rotated to causerotation and advance of the nut 35. If it is simply desired to carry thepencil with the point protected, the pencil is then reversed andreinserted into the nut 35, the point of the pencil entering into thehole 36. In case the pencil should be provided with a metal bandsurmounted by an eraser, it may be necessary to so reverse the pencil inorder to rotate the nut 35. The friction strip 40 retains the pencilsecurely in the sleeve 33, yet it yields to a slight pulling force onthe pencil so that the latter may be readily extracted.

In using the Sharpener, the plug 17 is unscrewed from the body 1i), thepencil is inserted into the conical recess 22 and held tightly in onehand while the plug is rotated with the other, or vice versa. When onecutting edge of the blade has become dulled, the blade is unscrewed andreversed so that the fresh edge enters the slot 23.

Obviously modications in form and structure may be made withoutdeparting from the spirit and scope of the invention.

I claim:

l. A device of the class described comprising a hollow body having acylindrical threaded channel passing therethrough, a cap threadablyengaging one end of said channel, said cap having a cylindricalextension provided with a conical recess, the axis of said conicalrecess being inclined with respect to the axis of said extension, saidextension having a longitudinal slot in the surface thereofcommunicating with said recess and a groove therein parallel with saidrecess, and an arched blade secured to said extension and having a pairof parallel side edges, one edge thereof projecting through said slotinto said recess, and the other registering in said groove.

2. A device of the class described comprising a hollow body having acylindrical threaded channel passing therethrough, a cap threadablyengaging said channel and having a cylindrical extension, said extensionhaving a conical recess therein having its axis inclined with respect tothe axis of said extension, said extension having a longitudinal slot inthe surface thereof communicating with said recess and having a groovetherein parallel with said slot, and an arched blade secured to saidextension having a pair of sharpened side edges, one of said edgesregistering in said slot and the other in said groove.

3. A device of the class described comprising a hollow body having acylindrical threaded channel passing therethrough, a cap threadablyengaging said channel and having a cylindrical extension, said extensionhaving a conical recess therein having its axis inclined with respect toythe axis of said extension, said extension having a longitudinal slotin the surface thereof communicating with said recess and having agroove therein parallel with said slot, and an arched blade secured tosaid extension having a pair of sharpened side edges, one of said edgesbeing adapted to register in said slot and the other in said groove andmeans for releasably locking said blade on said extension.

HENRY ROHW'EDDER.

